Locomotive-boiler.



S. COLEMAN.

c. DUC/IS & H

Patehted. June 22, 1915.

I ATTORNEYS.

THE NORRIS PETERS 50.. FHoT0-L!THO.. WASHINGTON, D. C

me a,

CHARLES DUCAS AND HARRY S. COLEMAN,

OF NEW YORK, N. Y., ASSIGNORS T0 JACOBS-SHUPERT UNITED STATES FIRE-BOX COMPANY, OF NEW YORK, N. Y., A CORPORATION OF PENNSYLVANIA.

LOCOMOTIVE-BOILER.

mascot.

Specification of Letters Patent.

Patented June 22, 1915.

Application filed October 21, 1914. Serial No. 867,721.

To all whom it may concern:

Be it known that we, CHARLES DUCAS and HARRY S. COLEMAN, of New York, in the county of New York, and in the State of New York, have invented a certain new and useful Improvement in Locomotive-Boilers Having Sectional Fire-Boxes, and do hereby declare that the following is a full, clear, and exact description thereof.

The object of our invention has been to provide an improvement in boilers having fire-boxes composed of vertical sections, which shall enable the top of the crown sheet portion of the fire-box to be inclined downwardly in a rearward direction, and which improvement shall have the advantages of simplicity and cheapness of construction, and of enabling the standard Sections of the ordinary uninclined type of sectional fire-box to be used, and to such ends our invention consists in the improvement in locomotive boilers having sectional fire-boxes hereinafter specified.

In the accompanying drawings, the figure is a vertical, longitudinal sectional view of a portion of a locomotive boiler embodying our invention.

Where a locomotive is used on steep grades, the position of the locomotive when going down grade, tends relatively to raise the rear end of the crown sheet and depress the forward end thereof so that the water tends to uncover the rear end of the crown sheet and thus to expose it to the fire with out an adequate quantity of water in contact with it to carry off the heat and prevent the crown sheet from becoming overheated and perhaps burned. This condition is harmful to the life of the crown sheet and is liable to result in an explosion, and it has, therefore, been customary to slope the crown sheet downwardly in a rearward direction upon such locomotives, so as to insure that the crown sheet shall be below the level of the water when the locomotive is on a down grade.

It is the object of our invention to enable locomotive boilers having fire-boxes composed of vertical sections to be constructed with the crown sheet portion thus inclined, and to do so in such a manner that the construction shall be simple and cheap, and shall permit to a maximum extent the use of standard parts, of which such a fire-box is composed when the crown sheet is not inclined.

While our invention is'capable of application to fire-boxes in general of the type referred to, we have chosen to illustrate it by its application to a fire-box of the type shown in the patent to Frank W. Shupert and Henry W. Jacobs, No. 917 ,172, patented April 16, 1909.

Referring to the accompanying drawings, our fire-box comprises a throat sheet 1, which is secured to the shell of the boiler (not shown) and a flue sheet 2, in which are secured the fines 3. The throat sheet and flue sheet terminate in vertical flanges at the bottom, the space between which is closed by a mud-ring 4. On their rear faces the throat sheet and flue sheet are respectively provided with out-turned vertical flanges 1 and 2 respectively, which are connected by staying of any suitable sort, such staying in the present instance being shown as stay sheets 5, like those shown in Figs. 11 and 12 of the said J acobs-Shupert patent. The main portion of the legs and top of the firebox is composed of inverted Ushaped sections (inner 6 and outer 7), whose feet, so to speak, are secured to the inner and outer sides of the mud-ring at the bottom, each of which sections is provided with outwardly projecting flanges 6 and 7 respectively, and the said sections are secured to the fiue sheet and throat sheet and to the stay sheets by rivets passing horizontally through the outwardly projecting flanges. The throat sheet and flue sheet are expensive to make, and are usually made by the aid of dies, and the U-shaped sections are likewise made with dies, so that it is desirable to be able to make such parts standard and as much alike as possible whether or not the top of the crown sheet is to be inclined. WVe have conceived that by making a pair of inner and outer sections so that they taper from top to bottom, such as the sections 8 and 9 respectively, we can cause the top of the crown sheet to incline downwardly in a rearward direction from a point where such tapered sections are introduced into the series. This particular way of carrying out our invention enables us to use a standard fiue sheet and throat sheet, which parts are much more expensive to make than the U-shaped sections,

, This control over the point where the incline shall begin is an advantage, because it is not always necessary to have the entire top of the crown sheet inclined, and by not inclining it, a slightly increased combustion chamber is obtained.

We claim:

1. In a locomotive boiler, the combination of a boiler shell and a fire-box composed of vertical sections, having substantially parallel front and rear sides, of a wedge-shaped section located at the point where it is desired to have an incline at the top of the crown sheet begin.

2. In a locomotive boiler, the combination of a throat sheet and a flue sheet, having rear faces perpendicular to the flues, and a fire-box composed of vertical sections, whose front and rear faces are substantially parallel, and a wedge-shaped section introduced between said throat sheet and flue sheet and the fire-box sections whoseupper surfaces it is desired to have inclined.

3. In a locomotive boiler, the combination of a shell and flues, and a fire-box composed of vertical sections whose front and rear surfaces are substantially parallel, and a wedge-shaped section located at an intermediate point in said series of vertical sections.

4. In a locomotive fire-box, the combination of a shell and flues, a throat sheet and flue sheet having outwardly turned flanges, inner and outer sections, having outwardly turned flanges that are substantially parallel, and inner and outer sections having outwardly turned flanges, said flanges on said last mentioned sections being in. planes inclined to each other.

In testimony that we claim the foregoing we have hereunto set our hands.

CHARLES DUCAS. HARRY S. COLEMAN.

Witnesses EDWIN J. PRINDLE, SAMUEL ScmvAnTzMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of yatents,

Washington, D. 0. 

